Force touch display device and force touch control method

1. A force touch control method, comprising: a step S 1 , providing a force touch display device comprising a substrate, an organic light emitting diode (OLED) layer disposed on the substrate, a strain layer disposed on the OLED layer, and a touch function layer disposed on the strain layer; the OLED layer comprises an anode disposed on the substrate, a light emission layer disposed on the anode, and a cathode disposed on the light emission layer and comprising a pressure detecting pattern; a step S 2 , entering a first stage and performing touch detection by the touch function layer while the OLED layer illuminates; and a step S 3 , entering a second stage and performing pressure detection by cooperation of the cathode and the touch function layer while the OLED layer stops illuminating; wherein in the step S 1 , the touch function layer comprises a touch substrate layer disposed on the strain layer, a plurality of induction electrode chains, and a plurality of drive electrode chains paralleling one another at intervals and disposed on the touch substrate layer, the induction electrode chains insulatively intersect the drive electrode chains, and the cathode comprises a plurality of electrode strips paralleling one another at intervals and disposed opposite to the drive electrode chains respectively, wherein the pressure detecting pattern is formed by the electrode strips paralleling one another at intervals; wherein a first capacitor is formed between the induction electrode chains and the drive electrode chains, and a second capacitor is formed between the drive electrode chains and electrode strips, and the step S 2 performs the touch detection by detecting variation of the first capacitor, and the step S 3 performs the pressure detection by detecting variation of the second capacitor; wherein in the step S 2 , a first voltage is applied to the drive electrode chains, and an OLED drive voltage is applied to the electrode strips, and the variation of first capacitor is determined by detecting time required for the induction electrode chains reaching the first voltage to complete the touch detection, and in the step S 3 , a second voltage is applied to the drive electrode chains, the OLED drive voltage is stopped from being applied to the electrode strips, and the variation of the second capacitor is determined by detecting time required for the electrode strips reaching the second voltage, to complete the pressure detection.

2. The force touch control method as claimed in claim 1 , wherein in the step S 1 , the strain layer comprises a deforming portion and a supporting frame surrounding the deforming portion.

3. The force touch control method as claimed in claim 2 , wherein material of the deforming portion is liquid glue.

4. The force touch control method as claimed in claim 1 , wherein in the step S 1 , the force touch display device further comprises an optically clear adhesive disposed on the touch function layer and a protective lid disposed on the optically clear adhesive.

5. The force touch control method as claimed in claim 1 , wherein each of the induction electrode chains comprises a plurality of induction electrodes arranged at intervals and a plurality of first connecting portions located at intersection positions between the induction electrode chains and the drive electrode chains respectively, and adjacent two of the induction electrodes are electrically connected to each other by one of the first connecting portions; and each of the drive electrode chains comprises a plurality of drive electrodes arranged at intervals and a plurality of second connecting portions located at the intersection positions between the drive electrode chains and the induction electrode chains, adjacent two of the drive electrodes are connected to each other by one of the second connecting portions, and the second connecting portions are insulated from the first connecting portions.